Onion and sausage cook in olive oil ( you should check the ammount of oil, depending on how fat the sausage is), now add tomato paste and wine. Let it cook a little, until it's all well mixed and a bit evaporated.
To make a real Napolitan pasta you'd better take paccheri (big thick pasta), but I think you can easily substitute.
Boil pasta. Use some of that water to make the sauce more thin and add basil. Cooking time will be around 10 minutes.
Serve over pasta and eat immediately!